More on LinuxToday

Linux.com: CLI Magic: Ifconfig

"Want to learn something that will make your Windows-based
friends squirm with feelings of geek-envy and inadequacy? Of course
you do. Well, jump out of the GUI for bit and join us on the
command line as we explore the magic of the ifconfig command.

"Ifconfig is one of the handiest tools around for tweaking your
home network or resolving networking difficulties with your laptop
while you're on the road. It's used in two ways: to display the
status of your network devices and/or to configure those
devices..."